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• Users: physicszman
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1. ### 2 simple oscilliation problems. !

1) You are a new employee at the Cut-Rate Cuckoo Clock company. The boss asks you what would happen to the frequency of the angular simple harmonic motion of the balance wheel if it had the same density and the same coil spring (thus the same torsion constant), but all the balance wheel...
2. ### Check my math and units please

If you guys can check the math on these last 3 questions I would be very greatful. Sorry to throw this many questions at you but I've been doing physics 3 days straight now reviewing for my final tomorrow. Any help would be awsome. :approve: 1. How much heat energy is required to convert a...
3. ### LOADS of Final Review Questions

Thanks for the clarification on #13 doc. Thanks for checking my answers Janitor I really appreciate your time and for some reasons understand your explanatiosn better than my professors.
4. ### LOADS of Final Review Questions

Hi, these are off of my final review sheet. Theres a lot of them but I think most my answers are correct :rofl::rofl: * = my answer. 1. Kinetic Theory accounts for the increase in pressure as a confined gas is heated by what? *An increase in particle motion, more violent and frequent...
5. ### 8 Homework Problems help!

Thanks for helping Janitor. 1) Since the mass is greater on weekdays the period of oscillation with be greater. 3) Thanks for the tip about beat frequency! The formula is Fb = |F1-F2| Interference will alter the sound. Fb = |100kHz-102kHz| = 2kHz the human ear can hear at 2kHz...
6. ### 8 Homework Problems help!

3) Sorry! **A human ear cannot hear sound at a frequency of 100 kHz or a sound at 102 kHz. But, if you walk into a room in which two sources are emitting sound at 100 kHz and at 102khz, you'll hear sound. Explain why this is possible. *Has to do with the two frequencies combining? (No idea...
7. ### 8 Homework Problems help!

Some chapter review problems in the back of the book I was having trouble with. Any help is appreciated. (Not asking for answers but directions and formulas explanations if possible) Thank you! 1) The Empire State Building in New York City oscillates in the wind with a period of 8 seconds. Do...
8. ### Quick algebra questions.

Hi, this is a bit of topic but I could not find any good algebra forums. Havn't done this since freshman yr so I am a bit rusty. 1) 6x - x^2 = x *I set this to zero and factor and get -2, and 3. But it doesn't work when i plug it back in? where did I mess up? 2) 5 - 35/x^2 = 0 *No...
9. ### MINIMUM force that a technician must exert on this wrench to deliver this torque

1) A manual specifies that certain bolts are to be tightened to a torque of 150 N/m. a) Using a wrench whose handle is .03 m long. what is the MINIMUM force that a technician must exert on this wrench to deliver this torque. b) Make a drawing to show how this is possible that the same...
10. ### 5 quick hw problems

Yea that's the answer I got too, thanks for the help!
11. ### 5 quick hw problems

For # 3 I don't understand how you got (3439/2).
12. ### 5 quick hw problems

1) A spring bathroom scale is designed to report the amount of upward force it's exerting on the objects touching its surface. a) When you first step on the scale, you usually have some downward velocity because you "land" on the scale. As it slows your motion to bring you to rest, does teh...
13. ### What is the tension in the cable

53.1 degrees from west axis. I hope this sounds right. Thanks again for all your help!
14. ### What is the tension in the cable

Last question.. So what do I do with the 4/3 take the "arctan" of it? Thanks
15. ### What is the tension in the cable

angle = (80N/60N)/tan = 57.2 Thats how I got the previous answer. How do I calculate it the right way? And I guess it would be from the X axis since the y-component of the force is greater.
16. ### What is the tension in the cable

Hi, thanks for your help. I think I realized what I did wrong. You have to turn the formula around to solve for just the angle so its angle = (80N/60N)/tan = 57.2 Do I answer the direction is 57.2 degrees North West?
17. ### What is the tension in the cable

4) A rescue helicopter is lifting a man (weight- 822 N) from a capsized boat by the means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 1.10m/s^2? (b) What is the tension during the remainder of the rescue when he is pulled...
18. ### 5 Quick Questions

So for #2, you said it depends if the frictional force is adding or subtracting. If the ball is thrown up it is adding to the weight so it would be positive f. But when it is falling it is subtracting. For #3. You are not able to tell whether the object is moving at those velcoities because...
19. ### 5 Quick Questions

1) A father and his seven year old daughter are facing each other on ice skates. With their hands, they push off against one another. (a) COmpare the magnitudes of the pushing forces that they experience. b (b) Which one, if either, experiences the larger accceleration. *I am thinking that...
20. ### Simple Questions, but confusing.

Thanks agian for all the help!
21. ### Simple Questions, but confusing.

The observer is going to see the bullet drop!
22. ### Simple Questions, but confusing.

They hit the ground at the same time.
23. ### Simple Questions, but confusing.

haha, ok, let me try again. I think he will see the bullet move twice as fast away from the train.
24. ### Simple Questions, but confusing.

Hey, sorry for the late reply I had a english class. 1) I believe that the speed relative to the ground will be 0 ft/s because 1000 ft/s West and 1000 ft/s east would cancel each other out. So the perso on the ground would see the bullet not moveing? 2) The answer is yes, it will hit the...
25. ### Simple Questions, but confusing.

Any help is appreciated! 1)A man standing on a railroad flatcar moving at 1000ft/s to the left fires a bullet, whose muzzle velocity is 1000 ft/s in the opposite direction. What does an observer on the ground see teh bullet do? *I think he sees the bullet fire away at 2000 ft/s in the...
26. ### Need help with some HW Problems!

Hey, quick question about number 4. Do I need to use the quadtratic formula to solve it? Thanks
27. ### Need help with some HW Problems!

Hi, I am going to start off by answering enigmas questions first. 1) Yes, a rapidly moveing object can have the same acceleration as a slowly moveing one because acceleration is just the rate by how much the velocity increases as time goes by. 2) When the object is thrown up it will...
28. ### Need help with some HW Problems!

Hey, Just wondered if any of you guys could help me out with these problems. Anything is appreaciated. 1)Can a rapidly moving object have the same acceleration as a slowly moving one? Why? 2) When you throw a ball straight up in the air, ignroing air resistance, what acceleration is it...